#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2018 Facebook.  All Rights Reserved.
#
# FS QA Test 176
#
# Test device remove/replace with an active swap file.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"

here=`pwd`
tmp=/tmp/$$
status=1	# failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15

_cleanup()
{
	cd /
	rm -f $tmp.*
}

# get standard environment, filters and checks
. ./common/rc
. ./common/filter

# remove previous $seqres.full before test
rm -f $seqres.full

# real QA test starts here

# Modify as appropriate.
_supported_fs btrfs
_require_scratch_dev_pool 3
_require_scratch_swapfile

# We check the filesystem manually because we move devices around.
rm -f "${RESULT_DIR}/require_scratch"

scratch_dev1="$(echo "${SCRATCH_DEV_POOL}" | awk '{ print $1 }')"
scratch_dev2="$(echo "${SCRATCH_DEV_POOL}" | awk '{ print $2 }')"
scratch_dev3="$(echo "${SCRATCH_DEV_POOL}" | awk '{ print $3 }')"

echo "Remove device"
_scratch_mkfs >> $seqres.full 2>&1
_scratch_mount
_format_swapfile "$SCRATCH_MNT/swap" $(($(get_page_size) * 10))
$BTRFS_UTIL_PROG device add -f "$scratch_dev2" "$SCRATCH_MNT"
swapon "$SCRATCH_MNT/swap" 2>&1 | _filter_scratch
# We know the swap file is on device 1 because we added device 2 after it was
# already created.
$BTRFS_UTIL_PROG device delete "$scratch_dev1" "$SCRATCH_MNT" 2>&1 | grep -o "Text file busy"
# Deleting/readding device 2 should still work.
$BTRFS_UTIL_PROG device delete "$scratch_dev2" "$SCRATCH_MNT"
$BTRFS_UTIL_PROG device add -f "$scratch_dev2" "$SCRATCH_MNT"
swapoff "$SCRATCH_MNT/swap" > /dev/null 2>&1
# Deleting device 1 should work again after swapoff.
$BTRFS_UTIL_PROG device delete "$scratch_dev1" "$SCRATCH_MNT"
_scratch_unmount
_check_scratch_fs "$scratch_dev2"

echo "Replace device"
_scratch_mkfs >> $seqres.full 2>&1
_scratch_mount
_format_swapfile "$SCRATCH_MNT/swap" $(($(get_page_size) * 10))
$BTRFS_UTIL_PROG device add -f "$scratch_dev2" "$SCRATCH_MNT"
swapon "$SCRATCH_MNT/swap" 2>&1 | _filter_scratch
# Again, we know the swap file is on device 1.
$BTRFS_UTIL_PROG replace start -fB "$scratch_dev1" "$scratch_dev3" "$SCRATCH_MNT" 2>&1 | grep -o "Text file busy"
# Replacing device 2 should still work.
$BTRFS_UTIL_PROG replace start -fB "$scratch_dev2" "$scratch_dev3" "$SCRATCH_MNT"
swapoff "$SCRATCH_MNT/swap" > /dev/null 2>&1
# Replacing device 1 should work again after swapoff.
$BTRFS_UTIL_PROG replace start -fB "$scratch_dev1" "$scratch_dev2" "$SCRATCH_MNT"
_scratch_unmount
_check_scratch_fs "$scratch_dev2"

# success, all done
status=0
exit